Book: Stopp, Klaus. 1997 The Printed Birth and Baptismal Certificates of the German Americans. 2.
• Published on p. 118.Book: Ames, Kenneth L. 1977 Beyond Necessity: Art in the Folk Tradition.
• Published on p. 50, no. 44 and p. 124, fig. 191.Book: Earnest, Russell D. & Earnest, Corinne P. 1997 Papers for Birth Dayes: Guide to the Fraktur Artists and Scriveners. 2 vols. 909.
• Published on p. 598. For more info. on Otto, see pp. 594-600.